Starting around 1:00 Central Time, the instance for the Broken Isles Scenario went down, causing all fresh 100's on the leveling realms to be unable to progress. You can queue up for the event, but it will take you to the overworld map loading screen, leave you there, and then drop you back on the boat in Stormwind Harbor and give you the error message: "Transfer Aborted: Instance not found."

Blizzard, I can't find bugs while leveling if the bugs form an Ahn'Qiraj wall!